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Common Unit Repurchase and Retirement (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 23 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 29, 2012 | Jan. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2011 | Oct. 31, 2011 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2012 | Jul. 31, 2010 Plan II [Member] | Jul. 31, 2012 Plan III [Member]
Common Unit Repurchase and Retirement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common units |  |  |  |  |  |  |  |  |  |  | 7,250,000 |  |
Partnership's common units authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 3,000,000
Additional partnership's common units authorized for repurchase |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Average Price Paid per Unit | $ 4.54 | $ 4.63 | $ 5.21 | $ 4.95 | $ 4.96 | $ 4.62 | $ 5.17 | $ 4.94 | $ 5.19 | $ 4.44 |  |  |
Number of repurchased units acquired in private sale |  |  | 1,750,000 |  |  |  |  |  | 1,500,000 |  |  |  |

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- Definition The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 16 -Subparagraph a, b -Article 6 + Details
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- Definition Units that were previously issued and have been repurchased during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 + Details
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